Engine for rock-drilling machines.



PATENTED JULN 17, 1906.

vNo. 826,456.

E. M. WALKER. ENGINE EOE ROCK EEILLING MACHINES.

APPLIGATION FILED APB.. 1, 1905.

2 SHEETS-SHEET l` @witnesses PATENTED JULY 17, 1906.

No. 82E-,456.

, G. M. WALKER.

ENGINE EOE EoEK DEILLING MACHINES.

APPLICATION FILED APRA, 1905.

f 2 SHEET'S-SHEET 2.

K specification.

UNITED srArEsj CASSIUS M. WALKER` OF PATENT OEEIOE.

PUEBLO, COLORADO, AssioNoa rro THE WALKER- MOORE ROCK DRIl'LL MANUFACTURING AND SUPPLY KADO.

Specification of Letters Patent'.

OF COL( ENGINE Fon r=zooK-D|=u |Nel MACHINES.

Patented July 17, 1906.

Original application filed November 28, l 904, Serial-No. 234,608. Divided and this application iled April 1,1905. Serial No. 25 3,301.

To (1f/ whom/,ft may concern;

Be it known that I, CAssIUs M. WALKER, a citizen of the United States, residing at Pueblo, in the county of Pueblo and State of Colorado, have invented certain new and useful Improvements in Engines for Rock- Drilling Machines, of which the following is a My invention relates to valve devices, and more especially to valve devices of a character adapting them to a rock-drill or Aother structure in which there is a reciprocating member, such as a hammer or piston; and my invention consists in the construction and arrangement oi thc valve and its operating means, as fully set forth hereinafter and as illustrated in the accompai'iyin(Y drawings, in which-- Figure l is a vertical section of a rock-drill provided with my improvements; Fig. 2, a perspective view `showing the construction of the valve and its connections with the operating'piston or hammer. Fig. 3 is a transverse section on the line 3 3, Fig. l. Figs. -i and 5 are views illustrating the different positions oi' the valve.

My improvements may be used in connection with drilling apparatus of diil'erent con structions; but I have illustrated the same and will describe the operation in connection with the construction' of apparatus set forth in an application of which this is a division, filed November 28, 1904, Serial No. 234,608. It will not be necessary to describe in detail the features of said apparatus, except to specify that there is a cylinder or casing consisting oi two connected sections l 2, a hammer 6, reciprocating in the said casing and acting against the head of the chuck 8, sliding through a packed Opening at one end of the casing and supporting the drill 32, which is surrounded by a tube 51, that serves to conduct a l'luid n nder pressure to the cutting end of the drill, The cylinder contains ports 15 and 16, leading from the chamber of thel valve l, the said chamber also communicatl ing with an exhaust-port l' and the latter communicates, through a channel or passage it, with ports leading through. openings the gland to the tube 3l.

in The channel le 4communicates with a portlS., which may be put- 1n communication with a second ort 33a in Said channel through the medium o means l whereby the escape of a fluid from the port 13 may be the means of carr *ing a liquid to thc port 33a and to the tube 81. The features above described may be constructed and combined to operate in any suitable manner in connection with the improved valve and valve-operating devices, which l will now dcscribe.

The valve l has two heads (1Y I), connected by a curved web 4a, arranged above or bcyond the axis of the valve, the latter preferably tapering and shorter than the sockel in the casing, which socket communicates with an inlet-port 47, leading to the space between the two heads'of the valve, and an opening 4b in the outer head oi the valve permits the motor iluid to pass into the chamber Jobetween said head and the end of thc sockel., exerting a pressure tending to maintain the valve in its seat. A screw-plug el, closing the larger cnd of the socket, permits the insertion and removal of the valve.

The valve may bc shifted to the two posi tions shown in Figs. 4 and 5 to direct the motor fluid to the opposite ends of the cylinder,

respectively, and alternating from said ends j to the port e, leading to the exhaust-port l2.

The valve is rocked from the reciprocating hammer 6 through thc medium' of arock-arm J so engaging the hammer that its inner end will be reciprocated thereby. As shown, the said end is forked to engage a rib 38 upon the hammer.

It is desirable that after the valve is set to direct the flow of iluid to carry the hammer in one direction it shall remain in this position until the hammer nearly reaches the limit of its movement in said direction and that the valve shall then be suddenly shifted. I effect this result by providing contactshoulders upon the `valve so arranged that the arm J shall only contact with the same 'ust as the hammer completes its movement..

Vhile different c onstruction's may be used for this purpose, l have shownthe valve as having a socket in its inner head adapted to receive the cylindrical head 5C ofthe arm J and cut away so as to leave widely-separated shoulders 4g 4g, wherebyl the arm can have an extended play independently of the valve and will only come in contact with the shoulder as the arm completes its one direction Or the other.

movement in IOO ln order to avoid that wear vwhich would result from an extended rocking movement of' the valve, l have` arranged the ports 15 and lo upon a plane at one side` of the axis ol the valve and on that side nearest the exhaustport and have provided. the valve with the web 4, curved, as shown, so that a rocking movement of about one-eighth of a complete revolution is sullicient to carry the valve between its extreme positions. Further, by providing the valve with a web between two heads and admitting the pressui-e to the space between said heads the tendency is to liit the valve. and compensate for the pressure that it would otherwise exert downward upon its seat, while the pressure in the chamber x tends to hold it to its seat in the taperinU socket.

DWhen it is desired to utilize the exhaust for any purpose, it may be directed to a greater or less extent into the channel 14 or into a port 13, communicating with said channel, by means of a tapering valve 10, which extends into a chamber transverse to the exhaust-port 12 and communicating with the port 13. The valve 10 is of' such a shape that it may be turned to close the exhaustl port to a greater or less extent, as desired.

l do not here claim the features shown an also claimed in my aforesaid application Selmi No. 234,608.

Withoutlimiting myseltl to the precise construction and arrangement shown or to the use of the parts in connection with any special forni of drilling apparatus, l claim as my inventionl 1. The combination with the cylinder of a l -rock-dl'illinv machine and with its ports and tapering va ve-socket closed at each end, of a l tapering valve fitted to said socket, provided with two heads and an intervening web, the l ports communicating with the space between the heads, al chamber beyond the larger head i of the valve, a port in said head, a socket in i thc smaller head with separated shoulders below the same, and an arm with a head litted to said socket and extending between the shoulders to have a iimited motion independently ci' the valve for rocking the latter, substantially as set forth.

2. The combination with the hammer and valve-socket of a rock-drill, of a valve adapted tov said socket and provided at one end with a longitudinal socket with separated bearing-faces, and an arm having a head adapted to the socket in thevalve and extending between said faces and engaging the hammer, substantially as set forth.

3. The combination in a rock-Cirill, of a reciprocating hammer having an annular rib, a rock-valve, an actuating-arm for said valve pivoted to have a limited movement independent thereof and Jforked at the end and engaging the rib oi" the hammer, substantially as set forth.

4. The combinatioinin a rock-drill, of the casing having a valve-socket, a detachable plug closing the outer end ol" said socket, a hammer reciprocating in the casing, a rockvalve iitted to said socket, and an arm having a head litting a longitudinal socket at one end of the valve and engaging the hammer, substantially as set forth.

5. ln a rock-drilling machine, the combination with a cylinder, hammer reciprocating therein, and ports supplying pressure thereto, of a valve controlling the ports. and an arm looselyr connected to the valve at one end thereof and having a forked end adapted' to be engaged by the hammer, substantially as described. y 1

ln testimony whereof l have signed my name to this speciiication in the presence of two subscribing witnesses. y

CASSUS M. WALKER.

Witnesses:

WM. L. HARTMAN, E. M. PLEAs.- 

